Was the form that Saul saw actually Samuel the prophet, or was it something else? Answer? 1 Kings 22:22, and he said, "I will go forth and I will be a lying spirit." Do you hear, in Manhattan? If you've got your lessons filled out? You say the answers with me at home, call them out, helps you remember better. A lying spirit, are there spirits out there that lie? Evidently, yes. Revelations 16:14 tells us, "For they are the spirits of devils working miracles."
These fallen angels called demons and devils can create illusions. Remember Satan was an angel of light. He understood the power of the light and manipulating light, and creating three dimensional holograms and illusions. The devil can do that. He can project himself in ways that will deceive.